In a large mixing bowl, sift together cake flour, sugar, baking powder and salt. Add reserved cereal milk, eggs, butter and vanilla. Beat until just combined. Spoon doughnut batter in a gallon-size plastic zip top bag. Cut off a 1/2 inch piece from one corner. Pipe into each doughnut cup.

Bake 7-9 minutes or until the top of the doughnuts spring back when touched. Let cool in pan 4-5 minutes before removing.

For the glaze:

In small bowl, stir together sugar, reserved cereal milk and vanilla extract until sugar is completely dissolved. Use immediately to glaze donuts. Sprinkle top with Fruity Pebbles cereal. Serve immediately. Makes 12 doughnuts. One doughnut per serving.